I don't see the issue. I think the flashers are awesome. I get tailgated so often, I hope I dont get rear ended. That may save you from people not paying attention.

Now whacker phobes can worry about bigger issues. I have a local with a light bar and radars (or whatever they are) mounted on the trunklid... that's a whacker.
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2009 CVPI P71 - 145,000 miles/7,500hrs., Ex-Patrol - 35% Tint - 3.27 Open-Diff.SOLD
2011 CVPI P7B - 105,000 miles/8,000hrs., Ex-Patrol - 35% Tint - 3.27 Trac-Lok